OSI Layer Model Overview

OSI Layer Model OverviewOSI
Layers:- OSI
Layers or Model means is open system interconnect and OSI model tell that how
to data travel in digital world (network). OSI developed by the International
Organization for Standardization (ISO) in 1974.

1)
Application Layer:-
Application Layer is responsible for providing Networking services to the user
it means this layer is closest to the end user. It is also know as desktop
layer. Identification of services is done using port number. Data Flow From
Application Layer Data will be Data.

5)
Network Layer:- Network
Layer is responsible for providing best path for data to reach the destination.
Logical Addressing works on this layer and Router is a Network layer device.
Data Flow From Network Layer Segment will be Packet.

7)
Physical Layer:-
Physical Layer is responsible for electrical, mechanical and procedural checks.
Data will be converted into Binary i.e 0 & 1. Data will be in the form of
electrical pulses if it is Coaxial or twisted pair cable and in the form of
light if it is fiber optic cable. Data Flow From Physical Layer Frame will be
Bits.Devices
working at Physical Layer are Hubs, Repeater, Modems etc.